GraphEngine: Failed to serialize 'FanoutSearch.Action' to a type object.

my environment: Ubuntu16.04 x64 .NetCore 2.1.4 GraphEngine.Core 1.0.9083 (I build it myself,The NuGet package outdated.) GraphEngine.LIKQ 1.0.9083

My main test code: Global.LocalStorage.LoadStorage(); TrinityConfig.HttpPort = 80; FanoutSearchModule.EnableExternalQuery(true); FanoutSearchModule.SetQueryTimeout(3000); FanoutSearchModule.RegisterIndexService(Indexer); FanoutSearchModule.RegisterExpressionSerializerFactory(ExpressionSerializerFactory); TrinityServer server=new TrinityServer(); server.RegisterCommunicationModule<FanoutSearchModule>(); server.Start();

the exception throws at ` public class ExpressionSerializer:IExpressionSerializer { private static XmlSerializer m_serializer = null; private static NodeFactory m_factory = null;

    public ExpressionSerializer()
    {
        m_serializer=new XmlSerializer();
        m_serializer.AddKnownType(typeof(FanoutSearch.Action));
        m_factory=new NodeFactory();
    }
    
    public string Serialize(Expression pred)
    {
        //Exception throws here
        return pred.ToXml(m_factory,m_serializer);
    }

    public Func<ICellAccessor, Action> DeserializeTraverseAction(string pred)
    {
        var func_exp = m_serializer.Deserialize<LambdaExpressionNode>(pred)
            .ToExpression<Func<ICellAccessor, FanoutSearch.Action>>();
        return func_exp.Compile();
    }

    public Func<ICellAccessor, bool> DeserializeOriginPredicate(string pred)
    {
        var fun_exp = m_serializer.Deserialize<LambdaExpressionNode>(pred)
            .ToExpression<Func<ICellAccessor, bool>>();
        return fun_exp.Compile();
    }
}`

Exceptions Trace: Unhandled Exception: System.Runtime.Serialization.SerializationException: Failed to serialize ‘FanoutSearch.Action’ to a type object. at Serialize.Linq.Nodes.TypeNode.ToType(IExpressionContext context) at Serialize.Linq.Nodes.ConstantExpressionNode.set_Value(Object value) at Serialize.Linq.Nodes.ConstantExpressionNode.Initialize(ConstantExpression expression) at Serialize.Linq.Nodes.ExpressionNode1..ctor(INodeFactory factory, TExpression expression) at Serialize.Linq.Nodes.ConstantExpressionNode..ctor(INodeFactory factory, ConstantExpression expression) at Serialize.Linq.Factories.NodeFactory.Create(Expression expression) at Serialize.Linq.Nodes.LambdaExpressionNode.Initialize(LambdaExpression expression) at Serialize.Linq.Nodes.ExpressionNode1…ctor(INodeFactory factory, TExpression expression) at Serialize.Linq.Nodes.LambdaExpressionNode…ctor(INodeFactory factory, LambdaExpression expression) at Serialize.Linq.Factories.NodeFactory.Create(Expression expression) at Serialize.Linq.Extensions.ExpressionExtensions.ToText(Expression expression, INodeFactory factory, ITextSerializer serializer) at Serialize.Linq.Extensions.ExpressionExtensions.ToXml(Expression expression, INodeFactory factory, IXmlSerializer serializer) at People_LIKQ.ExpressionSerializer.Serialize(Expression pred) in /home/coder/Documents/NetCore/LIKQ-Examples/People-LIKQ/ExpressionSerializer.cs:line 30 at FanoutSearch.ExpressionSerializer.Serialize(Expression pred) at FanoutSearch.FanoutSearchDescriptor.<>c.<Serialize>b__22_0(Expression pred) at System.Linq.Enumerable.SelectListIterator2.ToList() at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source) at FanoutSearch.FanoutSearchDescriptor.Serialize() at FanoutSearch.FanoutSearchDescriptor._ExecuteQuery() at FanoutSearch.FanoutSearchDescriptor.GetEnumerator() at People_LIKQ.Program.LikqQurety() in /home/coder/Documents/NetCore/LIKQ-Examples/People-LIKQ/Program.cs:line 73 at People_LIKQ.Program.Main(String[] args) in /home/coder/Documents/NetCore/LIKQ-Examples/People-LIKQ/Program.cs:line 37